Last week at this time we previewed the U.S. Army Corps of Engineers' presentation to the Dallas City Council that said the city's close -- this close -- to getting those unacceptable levees back up to snuff. Our post had more info than Monday's actual briefing, which lasted all of 10 minutes when the council had not one single question for Rob Newman, the Corps' director of the Trinity River Project. The PowerPoint and the council briefing failed to answer several questions, actually, chief among them: How much has been spent bringing those levees back to "acceptable" since Period Inspection No. 9? And where did that money come from?

We've spent the better part of the last week trying to answer those questions. We began by asking Dallas City Hall, and Assistant City Manager Jill Jordan provided us with some numbers. But, she said, we'd have to ask Dallas Area Rapid Transit and the Texas Department of Transportation for theirs. By week's end, we had DART and TxDOT's figures as well.

The total is upwards of $76 million. The city's contribution to the levee fixes alone is by far the largest: $45,353,399.

The breakdown can be found in the PDF below, and as you can plainly see HNTB collected the biggest slice of the piece at $29,551,462, which came from the 2006 bond program (which was worth a whopping $1.35 billion). Per the city, the "infrastructure solutions firm" collected close to $30 million for "engineering services to provide geotechnical investigation, modeling, analysis, planning and design for the Dallas Floodway System Study." (That's a few million more than the $25 million Steve Thompson wrote about in 2012, when noting that HNTB was co-sponsoring a going-away party for Rebecca Rasor, then the city’s managing director of the Trinity River Corridor Project.)

Magnus Pacific Corporation received $10,626,480 (all but $300,000 of which also came out of the '06 bond program) for a "construction contract for the installation of underground slurry cutoff walls, Hampton Pump Station outfall improvements, and maintenance roads with the levees for the 100-Year Levee Remediation," says the city.

The rest of the money went toward removing trees, dealing with utility lines and replacing and repairing such things as retaining walls and guard rails. But you'll note: The PDF does not include the key component mentioned in the Corps' presentation: the East Bank-West Bank Interceptor Connector running beneath the river. The tunnel was damaged by flooding in January 2012, and if it isn't remediated by August, when the Corps wraps Periodic Inspection No. 10, then the levees will remain unacceptable.

And how much will that cost?

"The total cost for the East Bank-West Bank project is $25,624,991," says Cesar Baptista, assistant director for Dallas Water Utilities, via email. "The project involves tunneling of approximately 3,300 feet of 78- and 3,300 feet 96-inch wastewater pipeline. The estimated completion date for the entire project is December 2015."

Jill Jordan says that $25 million figure isn't included in the Period Inspection No. 9 figures since, well, it wasn't part of the inspection that led to the failing grade in 2009.

Morgan Lyons, spokesman for DART, says the transit agency kicked in $413,776.30 to repair the levees. The work, he says, was done in 2010, a year after the Corps broke the bad news to the city.

"We repaired the erosion under the columns of our Trinity River bridge," Lyons says. "Then we redirected the storm drains on the deck of the bridge so the water would run away from the levee and toward the river. This would help keep water off the bridge deck from pooling around the columns."

Tony Hartzel say TxDOT had several expenses related to the levees, beginning with the Margaret Hunt Hill Bridge. Says the agency's spokesman, that project ran "approximately $500,000 if you wanted to include engineering costs," in addition to a stability berm and seepage collars for the levee. Levee work on the Sylvan Avenue bridge cost an additional $410,050. He says TxDOT also "used its own resources for slope stability under various bridges at an estimated cost of $20,000."

"Geotechnical sampling and testing performed for the Trinity Parkway 30% complete design was used by HNTB for the City’s 100-year levee project," says Hartzel via email. "The effort was funded through the [Advance Funding Agreement] between TxDOT and NTTA. The total cost for drilling and sampling was approximately $4.2 million."

The cost of the Trinity River toll road is projected to be $1.5 billion.

When asked to verify these figures, the Corps said, "It's not something we track."